Everyone's done something daft which, at the time, seemed like the height of hilarity.
If you're lucky, nothing ever comes of it. But sometimes, it comes back to bite you spectacularly on the backside.
For example, when you sit down to sign, over and over again, the papers for a mortgage you've just had agreed.
Brad, who goes by the name Bradimal on Reddit , found this out for himself when he recently became a home owner.
Four years ago when renewing his US driving license, Brad thought it would be funny to draw three cats' heads instead of a signature.
Miraculously, he got away with this and his license has since been a great source of amusement every time he's had to get it out and show it.
Fast-forward four years and now Brad has bought a house, something he thought would never be possible.
He writes: "I have always signed my name with my regular signature/scribble, not cat heads. This hasn't been a problem until today when I had to sign my mortgage papers.
"The signing agent looked at my ID and shook his head, he was not amused.
"I tried to explain that 2015 Brad never imagined he'd own a house. So the dude has to call the title company headquarters and explain the situation all while my real estate agent is laughing her ass off.
"I had to sign 3 cat heads over 30 times today."
Brad's story amused others greatly, and even inspired one which is almost as entertaining.
In response, another man wrote: "I worked in a call centre for a bank, Santander, and once dealt with an irate man once who was being blocked from his online banking because he couldn't answer any of his security questions.
"They were all along the lines of 'name of your niece', 'name of your first pet', 'name of your favourite teacher'.
We weren't allowed to tell them the answers, just help reset them, which is a shame, because I really wanted to discuss how big of a coincidence it was that his niece, first pet AND favourite teacher were all called 'F**K SANTANDER'".
